Draft Document - Petroleum and natural gas industries - Drilling and production equipment - Subsurface barrier valves and related equipment (ISO/DIS 28781:2009); English version prEN ISO 28781:2009
文件草案-文件草案-石油和天然气工业-钻井和生产设备-地下隔离阀和相关设备(ISO/DIS 28781-2009);英文版prEN ISO 28781:2009